Abstract
The residual stress generated in a diffractive grating formed by ultraviolet (UV) curable resin was analyzed using a photoelastic technique. The stress was expressed as isochromatics and principal-stress directions, which are obtained using a four-step phase-shifting technique based on a plane polariscope. The specimens consisted of a steel mold with a diffraction grating pattern, glass plates and UV curing resin in liquid form. The specimens were illuminated with UV rays downwards from the upper side of the specimens, and the photoelastic images of the resin after curing were captured using a digital camera. Results indicated that the residual stress generated in the resin was complex.
